It’s hard to fairly judge something like the track when it’s not up and integrated with whatever new theming Merlin plans on installing.
However, based on what we’ve seen in the video, I have to say that perhaps controversially, I’m not a fan of how the track looks with the veins. I actually think that plain black could have looked more appealing, or perhaps something more akin to the colour scheme the ride originally had. I appreciate the effort, but something about the painted on veins doesn’t really appeal to me, personally.
Nonetheless, it is hard to fully judge based purely on a 1 minute video, and I confess that it’s not something I should properly judge until the track is up and the new theming is installed. And besides, the track colour is a relatively unimportant detail of the overall ride experience.